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Obviously you were thinking about this issue. Your approach of how to choose colors for the presentation should be very careful.
It is necessary to pick colors for the presentation beforehand: usually there are three to five main colors, which include both warm colors and cold ones. Obviously, any of these colors should be well read on the background of the presentation. If there is the slightest suspicion that the font color merges with the PowerPoint background (even a little bit) – there should be immediate replacement. Do not force people to spoil their eyesight.

Moreover, always follow this color scheme in all PowerPoint slides. This choice is considered a good style in creating any professional presentation. However, there is another point of view, proposed by the Danish professor Ole Laudrisen.
But first of all, let us recall few facts about the color perception.

1.    Using color schemes in PowerPoint presentation. Harmonious color combinations are called color schemes. Creating any PowerPoint presentation, there is no need to think deeply about color combinations. A huge number of color schemes with carefully chosen colors are available in the tab “Design”. It should be noted that choosing the color scheme from the list, you will “impose” it on themes, which in this case can be changed dramatically.

2.    Meaning of colors. The colors, chosen to represent your company, can tell a lot about you and your business. Are you sure that you use the most suitable colors?

Color selection is not determined only by a personal choice. There are colors that spontaneously can be associated with particular industries: such as blue color – marine companies, green with agencies to protect the environment. The question is how to reconcile the desire to be associated with a particular industry and the need to differ from competitors. Ultimately, the choice of colors will affect your company’s goals, philosophy and the image you create.

There are international standards that define the color values:

•    Red: danger
•    Orange: warning
•    Yellow: caution
•    Blue: notice
•    Green: safe

3.    Colors and attention. Within 40-45 minutes (regular class timing) level of the audience’s attention is not constant. Conditionally the class can be divided into three stages:

• Initially, a class focus increases constantly and keeps at a high level for about 10-12 minutes.
• Habituation occurs after 15 minutes, level of attention decreases and remains at a very low level.
• After another 15 minutes, the level of attention rises again, but it does not reach the high level of the first minutes of class.

Specialists offer not to do the whole presentation in same colors, as it is used to do. You can change the main color of the slide, depending on the moment of the show during the lecture – for example, you can change the background color of a slide presentation from the cold to the warm one and neutral: from blue and/or purple through yellow and/or orange to red and/or green.

This seems surprising and bold, but if you imagine that at exactly the moment when the audience starts nodding PowerPoint slides suddenly change their colors, become an active-yellow. This idea seems to be very productive. Afterwards, when the attention will be activated, the color of the slide can be changed to neutral. Try this trick and you will be surprised!